The photograph features an experimenter conducting tests to determine the maximum sensibility of sound instruments by striking measured blows on clay. A weight is dropped from decreasing heights until the sound can no longer be detected. This experimentation is part of war work and conducted by the Bureau of Mines.

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Size: 8448px × 5862px
Photo credit: © piemags/NSC / Alamy / Afripics
License: Licensed
Model Released: No

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